Version 3.0.0

This is breaking because SDK v157 changed a function parameter to the method user.getAuthSessionTicket, which now takes a string.

Changes from 2.0.0:

• Support SDK v158a (thanks @hylje for the help on #32)
• Add apps.isDlcInstalled
• Add game joining methods (apps.getLaunchCommandLineParam, friends.inviteUserToGame, friends.onGameRichPresenceJoinRequested) by @hylje on #33

Full Changelog: v2.0.0+fix...v3.0.0